China
Africa
Explore chapters and articles related to this topic
Biomagnetic and Bioelectric Imaging
Published in John G Webster, Minimally Invasive Medical Technology, 2016
Magnetopneumography is the study or measurement of the magnetic fields evoked by ferro- and/or ferrimagnetic contaminants or tracers in the lungs. The magnetic fields used for excitation are of the order of 1 mT to 1 T while the evoked magnetic field is on the order of nT. Liver susceptometry is used for quantifying iron levels in the liver. A liver biopsy is the invasive alternative to liver susceptometry. Other modalities such as quantified magnetic resonant imaging (qMRI) are also developing for this application. Finally, magnetic susceptibility plethysmography is mainly used to measure cardiac volume changes. The magnetic fields are of the order of 1–100 pT (Fischer and Heinrich 1992). In general we can say that biosusceptometry is being replaced by other more effective modalities such as sonography, X ray, CT, PET and MRI.
Gastrointestinal system
Published in David A Lisle, Imaging for Students, 2012
The two broad indications for guided liver biopsy are liver mass and diffuse liver disease. Liver biopsy may be performed under CT or US guidance. Core biopsy is often required, as fine needle aspiration may not provide sufficient material for diagnosis. Not all liver masses should undergo biopsy:Bleeding may complicate biopsy of haemangioma.Seeding of tumour cells may occur along the needle track following biopsy of hepatocellular carcinoma.Most liver masses are characterized with imaging as above and managed surgically or non-surgically without biopsy.
Organotin Compounds
Published in Fina P. Kaloyanova, Mostafa A. El Batawi, Human Toxicology of Pesticides, 2019
Fina P. Kaloyanova, Mostafa A. El Batawi
Two pilots exposed to fungicide mixtures during work had gastric pain, diarrhea, dryness of the mouth, severe thirst, and vision disturbances. Toxic hepatitis with hepatomegalia developed. Transaminase was elevated, and the highest values appeared after an interval of 6 weeks. Liver biopsy demonstrated diffuse steatosis. Hyperglycemia and glucosuria were present. Recovery occurred after 1 year in 1 of the pilots and after 6 weeks in the other. Three mechanics were also involved with less serious symptoms: diarrhea, headache, eye pains, blurred vision, epigastric pain, and thirst. Exposure was mostly inhalatory, but possible ingestion with contaminated food could not be excluded.14
Medical infrared thermal image based fatty liver classification using machine and deep learning
Published in Quantitative InfraRed Thermography Journal, 2023
Liver function tests are used to help diagnose and monitor liver disease or damage. In addition, medical imaging and rarely liver biopsy is performed during the evaluation process. Imaging approaches like ultrasonography (US), transient elastography, computed tomography (CT), and magnetic resonance imaging (MRI) are currently being employed in the clinical routine, however, liver biopsy is still perceived as the golden standard to assess progression in the disease [4]. After the biopsy, patients may encounter complications like bleeding, infection and puncture in biliary tract along with temporary pain. Early diagnosis of NAFLD can be ensured by regular follow-up of a patient, however, applying an invasive method like biopsy many times may cause other health risks.
A comprehensive review of endoscopic ultrasound core biopsy needles
Published in Expert Review of Medical Devices, 2018
Theodore W. James, Todd H. Baron
The original core biopsy needle was the Tru-Cut™ needle created by Travenol Laboratories in 1980 with the original purpose of providing tissue for evaluation of breast masses without the need for surgical biopsy [28]. Subsequently the needle was repurposed for transcutaneous liver biopsy in detecting the presence and nature of hepatic disease [29]. The first attempt at EUS-FNB utilized a prototype 2.8 mm channel convex array echoendoscope and a Menghini-type core needle (Figure 2) [30]. While this represented a major leap forward in the concept of core tissue acquisition through an echoendoscope, in practice it was plagued by poor penetration of solid pancreatic lesions as well as low histologic and cytologic yield.